Question

A closed cylindrical tube containing some water (not filling the entire tube) lies in a horizontal plane. If the tube is rotated about a perpendicular bisector, the moment of inertia of water about the axis

(a) increases
(b) decreases
(c) remains constant
(d) increases if the rotation is clockwise and decreases if it is anticlockwise.

Answer 1

Answer ⇒ Option (a) . ''Increases''.

Explanation ⇒

If the tube will be rotated in the horizontal direction then during the rotation water will move away from the axis of rotation.

As a result of this, the moment of inertia will be directly proportional to the square of the distance of the mass from the axis of rotation.

Hence the option (a). is correct.

Hope it helps.